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Two stainless steel toilets using the 1.6 gallon per flush valve were tested and are documented in this report. One toilet is a version of the existing TDC water closet design (designated TDC5) and represents a retrofit by changing the flush valve from 4.0 gallons to 1.6 gallons and modifying the rinse ring holes. TDC5 is intended for use within the Texas prison system only and does not satisfy the performance requirements of the ASME Standard at the specified operating pressure of 35 psi static. However, by raising the operating pressure to 65 psi static, all performance criteria specified in ASME Standard A112.19.6-1990 are met. The second toilet tested is the new prototype toilet (designated ATM7). This toilet is designed to meet all requirements as specified in the ASME Standard and is intended for use in new prison facilities. This toilet passed all performance criteria stated in the ASME Standard when operating with the 1.6 gallon flush valve at a static water pressure of 35 psi. However performance was very marginal and much improvement is possible. The flush line entrance diameter reduction to 1/4" is too restrictive and forces an excessive amount of water to the rinse ring. A larger flush line entrance diameter is needed, to enhance the removal of solids without degrading the flush surface rinse performance.